Lamp Electric Field Mark I
|Lamp Electric Field Mark I|
The front compartment contains:
- Three cells, electric, inert, "S," in series, carried in a compartment by themselves, with a drop door and catch.
- The optical arrangement which consists of a 2 1/2-inch parabolic glass reflector, fitted in an aluminum tube. The electric bulb (3.5 volt) is held horizontally in a sliding carrier, which is clamped to an ebonite block on the outside of the tube by means of a milled clamping nut. The carrier is capable of movement for focusing purposes. The tube has, on the outside, a metal slide which fits into a dovetail and holds the tube in position.
- A small terminal board of ebonite, with two terminals, and a brass tube which holds three spare lamp bulbs.
- The sending key and leads.
The centre compartment contains:
- Three cells, electric, inert, "S" (spare).
The rear compartment contains:
- A small kerosene oil lamp for the use of the writer and caller. This lamp is detachable and has a drop cover with side pieces which act as a wind screen. The flame is protected by a mica window. A small quantity of oil is carried in a tin held in a recess on the right of the lamp.
- Signal Training Part I, 1917, WO 3631